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Rh Arrows, route numbers, or other pavement markings may be used when required, particularly on four- and six-lane sections, to supplement directional or other signs, but no warning or direction shall be conveyed by pavement marking alone.

B. No-passing zones: On rural two-lane sections of the system a 4-inch barrier line, preferably yellow, shall be marked on the pavement parallel and adjacent to the center line wherever the sight distance is less than 1,000 feet. Such barrier lines shall be marked independently for each direction of traffic and shall be placed on the right of the center line in the direction of traffic affected. Barrier lines shall be used in conjunction with “No passing” signs above recommended.

C. Special treatment at interchanges: Where, on multilane sections, it is desirable to confine traffic to particular lanes, as at interchanges, continuous white lines shall be used in lieu of dashed lane lines.

Location and information signs.—The use of location and information signs shall be confined to points of general importance or significance. Such signs shall be of such size and shall be so located as not to detract from, or confuse the significance of other signs as herein recommended.

Discouragement of other signs and markings.—On rural sections of the interregional system that are designed in accordance with the standards herein proposed, it is recommended that the erection of signs and the marking of pavements, except as above proposed, be strongly discouraged.

''IX. Lighting.''

At all points on rural sections of the system where traffic speeds are required to be reduced because of merging traffic or where an unusual degree of caution is required because of traffic or other conditions, the interregional highway and, as necessary, its connections, shall be lighted by fixed-source illumination to provide a maximum degree of safety and convenience of movement at night. In all such cases appropriate transitional illumination between the lighted and unlighted sections shall be provided.

It may also be desirable to illuminate throughout their length rural sections of the system expected to carry large volumes of traffic, particularly if the traffic includes a large percentage of commercial vehicles.

X. Provision for public utilities.

The erection of electric light, power, and telephone poles within the right-of-way of rural sections of the system, except those necessary for service of the highway or its appurtenant facilities, shall be discouraged.

The construction of underground electric conduits and the laying of water-supply and sewerage pipes and pipes for other public-utility purposes, within the right-of-way of rural sections of the system, except those necessary for the service of the highway or its appurtenant facilities, shall likewise be discouraged. ere it is necessary to use the right-of-way of the system for electric facilities, underground construction shall be preferred to the erection of pole lines. Wherever underground electric, water, sewerage, or other facilities are constructed within the right-of-way, they shall in no case be constructed, except for crossing the highway, beneath any portion of the right-of-way to be used immediately or eventually for the construction of a pavement. 93800—44——12